Distancing between lines is inconsistent

Question

I am using the leaflet package, and on the first page I create two titles, a main big title and a smaller one.

This is a simplified version of the code I'm using:

\documentclass[10pt,foldmark,notumble]{leaflet}
\renewcommand*\foldmarkrule{.3mm}
\renewcommand*\foldmarklength{5mm}
\usepackage{setspace}
\usepackage{lipsum}
\begin{document}
\begin{center}

    \fontsize{30}{34}{\selectfont{}THE DIFFERENCE BETWEEN THE EARTH AND THE SKY}%

    \vspace{5em}

    \fontsize{23}{25}{\selectfont{}What does the it write this random text which is only a random text to test believing}

\end{center}

\newpage
\section{Abstract}
This is the abstract
\section{Objectives}
\lipsum[5-7]
\section{Techniques}
\lipsum[8-10]
\section{Conclusions}
\lipsum[14]


\end{document}

My questions are:

Notice the sub-title, the distance between the last two lines isn't equal to the first two. How can I fix it? Normal solutions I found after searching did not work..
How do I increase the distance between the lines of the main title?

The issue is entirely due to the fact that the lower case y descends below the baseline. — Willie Wong, Jun 03 '23 at 02:33
How can I increase the distancing between the lines to get rid of this artifact? — ellat, Jun 03 '23 at 02:35
I would also lose setspce. The only good reason to use setspace is if you are required to use "double spacing." — John Kormylo, Jun 03 '23 at 03:10

Willie Wong · Accepted Answer · 2023-06-03T02:54:10.410

There's probably a good explanation for this (and maybe someone more educated will come by and tell us), but somehow your extraneous set of braces around your title/subtitle is suppressing the baselineskip value. (The result you showed is not what it should look like with font size of 30 and a baselineskip of 34.)

So: remove those extra braces. At least on my computer this restores the correctly specified baslineskip values.

Update

As David Carlisle explains the baselineskip used is the value in effect at the end of the paragraph. By putting your \selectfont inside a pair of braces, the selected baselineskip value was reverted before the end of the paragraph.

So

You can remove the braces that surrounds {\selectfont{} ... }
Alternatively, you can end the paragraph yourself by adding {\selectfont{} ... \par}

Either will work.

Distancing between lines is inconsistent

1 Answers1

Update